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@eine feteeemt @fitte Letters PatentNo. 76,155, dated llarch 31, ISGS.

IMPROVEMENT IN PORTABLEV DERRIGKS.l

TO ALL WHOM IT MAY CONCERN: i

Y Be it known'thatl, GEORGE C.'BROWN, of the city of Philadelphie, State of Pennsylvania., have invented a. certain new and useful Improvement in Portable Derrieks; and I do hereby deolere thetthe following is a. full, clear, and exact description ofthe construction endoperation ofthe saine, reference being hed to the annexed drawings, making afpart of this specification, in which- Figure 1 is :i perspective View;

Figure l is e plan of the derrck-head with the cap Cgremoved.

Figure 3 is a. vertical section of derriek-head through line A B.

Figure 4.1 is a. side elevation of the cop C.

Figure 5 is o. plan'ot` cap C. Y

Figure 6 s c. side view of the socket AS, intowhieh the poles D ere fitted.

vFigure 7 is another viewef the same. n

K Description with reference to the drawings, in which like letters refer to like parts. lis :t perspective view, showing the derriek in position for use, with all the parts in their proper places, showing the cap C screwed on the top of the dcrriek-hed, answering two purposes, t'. e., protecting the sheaves E and rope F from the weather, and preventing the rope F from running olf of the she-.wes E. It is held in place by the serew-bolts G. The sockets S are shown with the polesD Fitted into them, and the sockets fitted in .thejews H, where they `:tre held by means of the boltsor pins l. The rope F is rovvc through the block K, and over the sheaves E in the drricli-head, when the whole'is ready for use in rvaisingeanl lowering heavy bodies. Fig. shows a. plan of the derrick-heed 0, with the sheaves E in'the vertical slots L madey to receive theu1,`in which they 'revolve freely, carrying the rope F over the bolt or pin M, shown by the dotted lines, elso'thejews H, in which the sockets S fitted; also the holes N for the screw-bolts' Gr, which hold the cap C in plnce.- i

What I claim es my invention, and desire to secure by Letters Patent, is-

The portable derrick, Composed of the head, with its :ino sheaves', .Sockets and legs, the wholeairrang/ed as sind for the purpose set forth.

GEORGE C. BROWN Witnesses:

JNO. HARTMAN, J r., J onNsoN HUGHES. 

